Moved to wizard forums - and welcome to Diablofans!
There's a bunch of issues with your build, I'll go through them one by one.
You're using Archon, which means you also want to use at least 2 or 4 piece bonus of Vyr (which you're doing, good) and The Swami (which you're doing, good) but also the Fazula belt. Try to get that. Move the Tal piece to the offhand, which means you have to get rid of the Chantodo's set - which is really not a big deal, since its damage pales in comparison, see below.
Since you're using Manald Heal, most of your damage will come from that. Here's an in-depth guide for the ring and its mechanics.
Again, since you have Archon in your build, you might want to get back into Archon as soon as possible. Using an Obsidian Ring of the Zodiac can help you with that. Using Archon/Manald heal and Convention of Elements requires a lot of cooldown reduction and timings, otherwise the ring is useless - I'd strongly advise to ditch that ring (for now) and replace Convention with Obsidian.
Is your issue damage or survivability? I see a lot of people using Power Hungry as passive, which is the ultimate "more damage" passive. But 30 yards is a long range, and unless you fish for rifts in which you can keep the mobs at bay it's not active a lot of the time. However, especially in the beginning toughness is an issue, so I'd advise to try something like Blur (flat damage reduction), Illusionist (more movement when you get hit), Dominance (especially nice for speed rifts when you're killing fast) or Galvanizing Ward (useful once you've learned to properly dodge stuff and don't get hit very often).
Ancient Parthan Defenders are the bracers that many people are using, but I'd also never forget the Ashnagar Blood Bracers (double your shield efficiency). APD only have a 25 yard range, so they basically only trigger when something goes wrong - since for Power Hungry you want stuff to be 30 yards away. APDs are also entirely useless against most rift guardians (when it's only one mob and most of the time 25+ yards away).
I think you're not proccing Arcane as fourth element? Could be wrong. Anyways, I'd suggest Teleport - Calamity, it's what most people use.
Your legendary gem choice is kinda... odd. Simplicity Strength only makes sense in builds where the majority of damage comes from primary spells; that's not the case. Mutilation Guard is inferior to Esoteric Alteration. I'd suggest Bane of the Trapped (the best damage gem) and Gogok (gives you attack speed, cooldown reduction, and dodge - all of which is useful). As third gem most people play Zei's Stone for more damage; that's one option - for toughness I always recommend people to start with Esoteric though.
Okay, those are some general hints. More specifically, it seems like you're *almost* playing the standard Manald Heal build, but not quite. There's tons of guides for it... for example, check out this one by Wudijo: https://www.youtube.com/watch?v=YSWV5xjk7yQ or the link I posted above for in-depth mechanics. It's not an easy build to learn, but it's the easiest to get to GR70 once you master it. No other builds will let you get to GR70 that fast for wizard, to be honest.